Improvement in fire-proof safes



, m9. SAFES, BANK PROTECHON A 0 RELATED DEVICES.

F. P. MATHER.

Hrs-Proof Safes..

No.155,325. Patented Sept.22,1874.

C the same degree of heat at all 1139. SAFES, BANK PROTECTION AND RELATED DEViCES.

UNITED STA E-s gatrfh ATENT OFFIG.

IMPROVEMENT lN FIRE-PROOF SAFES.

Specification forming part of Letters Patent No. 156,325 dated September 22, 1874 application filed chamber will be formed between it and the outer wall, against which these edges rest. To make this air-chamber continuous, so as to completely protect the interior of the safe, the

flanges betorementioned are pierced, so that I there may be free communication from one of these spaces to the other. WVhen the-safe is subjected to a great heat, the heated air within the chamber will freely circulate around the cabinet-work, and subject the latter to about points, asv is more fully hereinafter set forth.

1 Figure l is a perspective view of my invention, with a portion of the outer double wall of the safe removed. Fig. 2 is a transverse section.

. In the drawing, A represents the outer or filled double walls of a safe. .B are metallic plates, bent up to a bevel at their four edges,

to form the flanges a, which are joined together at the corners? Through each of' these flanges are punched or drilled the holes b. vFive of these plates B, ofthe proper size and shape,-are joined together, forming a box that, will fit tightly into the safe, the holes I; in the flanges being coincident with each other; these plates, in connection with theinner walls of the safe, forming a continuous airchaniber upon five sides. A door, 0, hinged at c, has attached to its inner face a similar plate, B, whose holes 11 are coincident with the holes b, so that wh'n'the, door is closed a June 17', 1874.

continuous air-chamber is formed upon all sides of the safe. D represents the cabinetwork usually placed in a safe, which, in my construction, is within the compartment formed by the plates B.

By constructing a safe in this manner, it,

will be seen that a continuous air-chamber, is

formed upon all sides of the safe, whenelosed; and should any portion of the same be subjeoted to a greater heat than the rest, the air confined in this chamber must necessarily circulate, the hotter air being .continnally re placed by the cooler, which thus equalizes the temperatnrewithin the walls of the safe, as it'is well known that the contents of the safe in a burning stroyed by the safe being subjected to a greater degree of heat at some one point than elsewhere; hence, it the temperature of its interior can be equalized, the heat will not be intense enough to ignite the wood-work.

Although I describe and prefer to make the said lining of metal, it is obvious that it may be madepartly of wood and partly of metal, or entirely of wood, and yet secure'the circulation ofair and equalization of the tempera ture around the inflammable contents of the safe.

WhatI claim as my invention, and desire to secure by Letters Patent, is-'- A fire-proof safe composed of 'an outer solid wall, A, and an inner wall, B, having doors,

as described, said inner wall being composed ot'six plates, with outwardly-flanged and pierced edges, joined together so as to form an air-chamber of truncated pyramidal shape between said walls on ,each side, which airbuilding are generally de-' chamber, by means of the holes b, shall entirely inclose the inner wall of the safe, s'u'bstautially as described and shown, and for the purposes set forth.

I Witnesses:

H. S. SPRAGUE, CHAS. J. HUNT.

FRANCIS P. MATH-ER. 

